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</code></pre></div><p><img src="/notebook/assets/img/Lusifer_201810310005.af50ffc0.png" alt="img"></p> <p>因为这台机器默认开启了 LVM，所以目前有一个 <code>extended</code> 分区和一个 <code>LVM</code> 分区，并且他们是完全重叠的。这是因为，LVM 分区作为一个虚拟的分区，完全占用了这个 extended 分区，原理图见下：</p> <p><img src="/notebook/assets/img/Bg7zYac6&amp;690.ec2c482c.png" alt="img"></p> <p>因此，现在需要做的就是将 extended partition (<code>sda2</code>) 扩展到最大，然后创建一个新的 LVM logical partition (<code>sda6</code>)，用它来填满 sda2</p> <h3 id="查看所有连接到电脑上的储存设备"><a href="#查看所有连接到电脑上的储存设备" class="header-anchor">#</a> 查看所有连接到电脑上的储存设备</h3> <div class="language-text extra-class"><pre class="language-text"><code>fdisk -l |grep '/dev'
</code></pre></div><h4 id="_1-块磁盘效果图"><a href="#_1-块磁盘效果图" class="header-anchor">#</a> 1 块磁盘效果图</h4> <p><img src="/notebook/assets/img/Lusifer_201810310006.b4409d04.png" alt="img"></p> <h4 id="_2-块磁盘效果图-新增磁盘-尚未挂载"><a href="#_2-块磁盘效果图-新增磁盘-尚未挂载" class="header-anchor">#</a> 2 块磁盘效果图（新增磁盘，尚未挂载）</h4> <p><img src="/notebook/assets/img/Lusifer_201810310007.73e5ae7e.png" alt="img"></p> <h3 id="创建-sdb-分区"><a href="#创建-sdb-分区" class="header-anchor">#</a> 创建 <code>sdb</code> 分区</h3> <div class="language-text extra-class"><pre class="language-text"><code>fdisk /dev/sdb
n	# 新建分区
l	# 选择逻辑分区，如果没有，则首先创建扩展分区（p），然后再添加逻辑分区（硬盘：最多四个分区 P-P-P-P 或 P-P-P-E）
</code></pre></div><p><img src="/notebook/assets/img/Lusifer_201810310008.2aed609b.png" alt="img"></p> <div class="language-text extra-class"><pre class="language-text"><code>回车
回车
回车
w	# 写入磁盘分区
</code></pre></div><h3 id="格式化磁盘"><a href="#格式化磁盘" class="header-anchor">#</a> 格式化磁盘</h3> <p><img src="/notebook/assets/img/Lusifer_201810310009.22ec66f6.png" alt="img"></p> <div class="language-text extra-class"><pre class="language-text"><code>mkfs -t ext4 /dev/sdb1
</code></pre></div><p><img src="/notebook/assets/img/Lusifer_201810310010.86ef7f51.png" alt="img"></p> <h3 id="创建-pv"><a href="#创建-pv" class="header-anchor">#</a> 创建 PV</h3> <div class="language-text extra-class"><pre class="language-text"><code>pvcreate /dev/sdb1
</code></pre></div><h3 id="查看卷组"><a href="#查看卷组" class="header-anchor">#</a> 查看卷组</h3> <div class="language-text extra-class"><pre class="language-text"><code>pvscan
</code></pre></div><p><img src="" alt="img"></p> <h3 id="扩容-vg"><a href="#扩容-vg" class="header-anchor">#</a> 扩容 VG</h3> <div class="language-text extra-class"><pre class="language-text"><code>vgdisplay
</code></pre></div><p><img src="/notebook/assets/img/Lusifer_201810310012.4d3e1ef6.png" alt="img"></p> <div class="language-text extra-class"><pre class="language-text"><code>vgextend ubuntu-vg /dev/sdb1
</code></pre></div><h3 id="扩容-lv"><a href="#扩容-lv" class="header-anchor">#</a> 扩容 LV</h3> <p><img src="/notebook/assets/img/Lusifer_201810310013.8ef5ae46.png" alt="img"></p> <p><img src="/notebook/assets/img/Lusifer_201810310014.138283aa.png" alt="img"></p> <div class="language-text extra-class"><pre class="language-text"><code># 增加指定大小
lvextend -L +30G /dev/ubuntu-vg/root
# 按百分比扩容
lvextend -l +100%FREE /dev/ubuntu-vg/root
</code></pre></div><h3 id="刷新分区"><a href="#刷新分区" class="header-anchor">#</a> 刷新分区</h3> <div class="language-text extra-class"><pre class="language-text"><code>resize2fs /dev/ubuntu-vg/root
</code></pre></div><h3 id="删除-unknown-device"><a href="#删除-unknown-device" class="header-anchor">#</a> 删除 unknown device</h3> <div class="language-text extra-class"><pre class="language-text"><code>pvscan
vgreduce --removemissing ubuntu-vg
</code></pre></div><p><strong>注意：不要卸载扩容的磁盘，可能出现丢失数据或是系统无法启动</strong></p></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2021/4/15 上午11:39:30</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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